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  • 1 National Agricultural Research and Development Institute Fundulea1 N. Titulescu str. Fundulea 915200 Romania
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Grain protein concentration is a major factor in determining bread-making quality of wheat. We studied the effect of chromosome 7B of the high protein line F26–70 on protein content, yield and heading date, by testing 45 recombinant substitution lines derived from the cross Favorit//Favorit/F26-70(7B) in field trials, in 2005–2007. In 2006 and 2007 the lines were tested with and without nitrogen fertilization. Genes located on chromosome 7B of line F26–70 had significant effects on grain protein concentration and on heading date of recombinant substitution lines, but not on grain yield. In the conditions of our trials, protein content was not negatively associated with grain yield. Association of high protein content with earliness was significant in one year out of three. The interaction between RSLs and nitrogen fertilization was not significant, suggesting that the high protein gene(s) on chromosome 7B might be also useful at low nitrogen availability. Segregation of RSLs for grain protein concentration suggests a small number of genes, possibly one gene, responsible for the variation caused by chromosome 7B. We conclude that the high protein gene(s) on chromosome 7B might be potentially interesting for breeding.

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